I wouldn't be surprised if there are several "official" figures, according to each contractor. Concrete contractors sometimes report based on the highest pour, not including any additional mechanical or screening elements.
I believe 400 LSD has ~2 stories of glass screening / crown, supported by steel, above the highest concrete level. This is how One Chicago and the Salesforce Tower's crowns were built-- the hollow interior space hosts HVAC equipment and the BMU. If we assume 12 ft per story, that's the exact difference between the 851' figure and the 875' figure.
Who knows if that's the reason behind these fluctuating heights, but that's my best guess. Frankly, the difference between them is invisible to the eye-- when it comes to objects this large, their apparent relative scale is more affected by distance! Unless you have a mega uber zoom lens or binoculars
Hard to tell from these grainy pics, but the corner cladding pieces are much thicker than the pieces between the bay windows-- as the setbacks get their cladding, it'll form a nice crisp outline. Should be cool!
It's nice to see the setbacks taking shape. They look nice but it definitely seems like they reduced the number of setbacks and/or condensed the setbacks further up the tower to create more typical floors within the main shaft of the tower.
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